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_=~-.,.~ However, in sortie i_nst:anres e~nc,re suitable quality coal 1s hear the surface, the <br />overFaurdan may be rerhovgd Wit1z a comhihation of Boyers ~tnd scr-aPE'.rs, "lhe over- <br />burd40. wquLcC ct~en be hayLed to, a stgckpile. nc Ql a<-ed qn m,ined-out areas Ear evvn- <br />tu91 tegradi_ng and rstopsoiligg. <br />Tb~ Pr'in.:iPie mining methoq used at TraPPer is diFrli_ne mihin~, tii.e„ hiring in <br />st>•iPs p§ra3_lel rq ttre flown hill Bib of the goal aeons, Each Pit is adjacent and <br />paEall,el to thb previ,pur; oqe. Pi,t 5ridths vary according t0 the 5peci,Eic site. <br />Tybically, bath c~,t is initiated near the caal outcropsnd woskeq down the hill <br />unkil th@ dippin& coal becomes too deep to rer=bver @cohomically. On occasion, <br />th6 cht may be worked hp the hill. When more tlr§n one 5e~n i5 recovbred, the <br />pattigg is temyve4 ih ohe qE ~evsrai methods, Thin partings up to te,n feet thick <br />are r§mnbed with a Hoztr, batkhoe or simtil§r ~quLprt16nG, Thicksr parLin~+s ire <br />rernovsd Wittr a dt§glina, 1;art;in~ m§y be Str!.pp~d up-dip or down-di0 depending on <br />tha p§rticular situation. Shrike-line: mining may" be Perfbrmed in§tead bE the <br />prasegt dip.-line minLn& method ip g@olagic ccmdtiPns allow. <br />Tha ebp of the uncovered co§1 is cleaned with ~'quipm@nt suc,h as a front end <br />loade[•, nrocUr graders of rybbsr I_irad dozar. The Goal i~ then either ripped with <br />a dozuc 4r <;rimed w~.th a [,wig-m§sced coal drill add k:he~l blasted. Hole spacings <br />vary dep@ndCng un cn§L thickn@ss, <br />Tfi~ hi~lee are leaded with AN'F~ or other blasting agknt~ acid stehiu5ed with drill <br />cuttings, 'she blast circuit is then cUnpletgd end the blast is initiated {refer <br />to Section 3.4). <br />Large 6a~,khves of fcvnt enci loaders ace used to load the coal into haul trucks. <br />The coal haulers CrahspUrt the coal frym the pit to the power plant's grizzly or <br />a coal. stockpile, The coal haulers exit Che pit via an inSlihed ramp and enter <br />onto Che haul road sysC@m ChaC cponNCts edch pit Co [he power Plant's grizzly and <br />thg ccJal stpckpil@s. AL a lacer date, a conveyor system may repl2ce pare of this <br />truek haul. <br /> <br />3-14 <br />R~.VFSEp FEB 1 "~ `81 <br />